DYNAMIC TORQUE CONTROL AWD SYSTEM AWD Control Switch Circuit

DESCRIPTION

The 4WD ECU assembly changes the control mode in response to the "Lock Mode" signal from the AWD lock mode switch (No. 2 combination switch assembly).

WIRING DIAGRAM

B00594EE39
*1 AWD Lock Mode Switch (No. 2 Combination Switch Assembly)
*2 4WD ECU Assembly

CAUTION / NOTICE / HINT

Note

When the 4WD ECU assembly is replaced with a normal one from another vehicle, it is necessary to perform calibration.

Click here

Tech Tips

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE


  1. INSPECT AWD LOCK MODE INDICATOR LIGHT


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Four Wheel Drive / Active Test

    6. According to the display on the GTS, perform the Active Test.


      Chassis > Four Wheel Drive > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      4WD LOCK Light AWD lock mode indicator light Indicator light OFF/ON Observe combination meter assembly

    7. When performing the 4WD LOCK Light Active Test, check 4WD LOCK Light in the Data List.


      Chassis > Four Wheel Drive > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      4WD LOCK Light AWD lock mode indicator light OFF or ON

      OFF: AWD lock mode indicator light off

      ON: AWD lock mode indicator light on

      		 -

      Chassis > Four Wheel Drive > Active Test
      Active Test Display
      4WD LOCK Light
      Data List Display
      4WD LOCK Light
      Result
      Proceed to
      Changes between ON and OFF
      Does not change between ON and OFF

    Does not change between ON and OFF

    REPLACE 4WD ECU ASSEMBLY for LHD: Click here
    REPLACE 4WD ECU ASSEMBLY for RHD: Click here

    Changes between ON and OFF

  2. INSPECT NO. 2 COMBINATION SWITCH ASSEMBLY


    1. Turn the engine switch off.

    2. Remove the AWD lock mode switch (No. 2 combination switch assembly).

      Click here

    3. Inspect the AWD lock mode switch (No. 2 combination switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 COMBINATION SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 2 COMBINATION SWITCH ASSEMBLY - BODY GROUND)


    1. B0059IUC05
      *a

      Front view of wire harness connector

      (to AWD Lock Mode Switch (No. 2 Combination Switch Assembly))

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I37-18 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 2 COMBINATION SWITCH ASSEMBLY - 4WD ECU ASSEMBLY)


    1. Reinstall the AWD lock mode switch (No.2 combination switch assembly).

      Click here

    2. Disconnect the I55 4WD ECU assembly connector.

    3. B008I8KC52
      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      I55-10 (4WDS) - Body ground Switch pressed and held Below 1 Ω
      Switch released 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE 4WD ECU ASSEMBLY for LHD: Click here
    REPLACE 4WD ECU ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR